[Spce-user] how to set port forwarding for spce

[yanzs]

Hi,

I have make calls successfully within LAN using spce.

Now I am trying to put it behind nat, and have set port forwarding for 
5060 of both TCP and UDP protocol.
The sip clients can register subscriber successfully after these port 
forwarding settings, but they cannot make call to each other, so what 
else ports should I set?
Or maybe I should not put spce behind nat? What is its disadvantage if 
that is the case?

Thanks,
Russell